@Agaricus I think I’ve reproduced this (much thanks to the screenshot and slack responses from @Beau_Gunderson). I tried adding an additional measure I think you wanted – reporting the peak frequency and the magnitude at that peak.
20190829 MPB tremor analysis.ipynb (14.1 KB)
I can help walk you through running this if you’d like. It’s a manually uploaded file, so Open Humans doesn’t provide any OH-specific value for this (yet), but does give you a standardized personal Jupyter instance. 